linux-kernel - [REGRESSION] XArray commit prevents booting with 6.0-rc1 or later

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Date:   Sat, 19 Nov 2022 05:07:45 +0100
From:   Jorropo <jorropo.pgm@...il.com>
To:     willy@...radead.org, linux-fsdevel@...r.kernel.org,
        linux-kernel@...r.kernel.org, nborisov@...e.com,
        regressions@...ts.linux.dev, stable@...r.kernel.org
Subject: [REGRESSION] XArray commit prevents booting with 6.0-rc1 or later

#regzbot introduced v5.19-rc6..1dd685c414a7b9fdb3d23aca3aedae84f0b998ae

Hi, I recently tried to upgrade to linux v6.0.x but when trying to
boot it fails with "error: out of memory" when or after loading
initramfs (which then kpanics because the vfs root is missing).
The latest releases I tested are v6.0.9 and v6.1-rc5 and it's broken there too.

I bisected the error to this patch:
1dd685c414a7b9fdb3d23aca3aedae84f0b998ae "XArray: Add calls to
might_alloc()" is the first bad commit.
I've confirmed this is not a side effect of a poor bitsect because
1dd685c414a7b9fdb3d23aca3aedae84f0b998ae~1 (v5.19-rc6) works.
I've tried reverting the failing commit on top of v6.0.9 and it didn't fixed it.

My system is:
CPU: Ryzen 3600
Motherboard: B550 AORUS ELITE V2
Ram: 48GB (16+32) of unmatched DDR4
GPU: AMD rx580
Various ssds, hdds and network cards plugged with various buses.

You can find a folder with my .config, bisect logs and screenshots of
the error messages there:
https://jorropo.net/ipfs/QmaWH84UPEen4E9n69KZiLjPDaTi2aJvizv3JYiL7Gfmnr/
https://ipfs.io/ipfs/QmaWH84UPEen4E9n69KZiLjPDaTi2aJvizv3JYiL7Gfmnr/

I'll be happy to assist you if you need help reproducing this issue
and or testing fixes.

Thx, Jorropo